Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagic angle spinning NMR studies of silicon carbide: polytypes, impurities, and highly inefficient spin-lattice relaxationJ. Stephen Hartman, Mary F. Richardson, Barbara L. Sherriff, and Beatrice G. WinsborrowCite this: J. Am. Chem. Soc. 1987, 109, 20, 6059–6067Publication D…
Abstract Low-temperature structural study of [(CH3)4N][Ni(dmit)2]2 suggested that the rotational freedom of methyl group seems to play an important role in the “metal-semimetal” transition. Superconducting transition was observed at 5 K (7 kbar).
In order to investigate the influence of oxygen on the chemical vapor deposition (CVD) of diamond, gas mixtures of H 2 –CH 4 and H 2 –CH 4 –O 2 were used to carry out thermal CVD. The effects of the oxygen additive were examined by gas chromatography for the exhaust gas and by a characterization of the deposits. With…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA possibility of crystal size distribution control using additives in batch-cooling crystallizationNoriaki Kubota and Hiroshi TakahashiCite this: Ind. Eng. Chem. Res. 1987, 26, 9, 1936–1939Publication Date (Print):September 1, 1987Publication History Published online1 May 20…
The newly discovered phenomenon of stress-dependent saturation magnetostriction, observed in low-magnetostrictive metallic glasses, is discussed. Its influence on the measurements of saturation magnetostriction is seen when the experiments are carried out by means of indirect methods based on the Villari effect. A pro…
Abstract Die Änderung der Molmassenverteilung linearer Poly(dimethylsiloxane) nach Kontakt mit Diethylamin und Diethylamin‐Kaliumhydroxid‐Gemischen wurde mit der GPC verfolgt. Der Abbau führt zu Polysiloxanen des Polymerisationsgrades 8 bis 20.
Abstract An analysis of the 1 H and 13 C NMR spectra of the chlorobutyl and bromobutyl rubbers was performed. Peaks were assigned based on evidence from broad-band decoupled, off-resonance decoupled, selectively decoupled and J-modulated spectra, the known characterization of butyl rubber and halogenation studies on m…
Relationships between the mean area, volume and thickness for dispersed particles of kaolinites and micaceous clays and their application to surface area and ion exchange properties - Volume 22 Issue 3
A pseudobinary phase diagram of the Nd- (Fe14,B) system and liquidus isotherms in the Nd2Fe14B(T1) primary field of the Fe-Nd-B ternary system were determined by DTA, XRD, metallography and EDX techniques. The peritectic region for the appearence of T1phase is in the range of 3 % to 40 % Nd for the pseudobinary system…
Abstract It is not an overstatement to say that natural rubber (NR) is one of the most used polymers. There are numerous studies dealing with the structural aspects of rubber which give rise to its elastic property. However, it should be emphasized that the majority of these studies are generally concerned with rubber…
The luminescent properties of hexagonal have been investigated. For and at room temperature, excitation into the Ce 3+ ion results mainly in Tb 3+ emission. We also observed two different Ce 3+ emissions. This is related to the crystal structure of . It is shown that the excitation energy migrates from the Ce 3+ ion o…
By using a recently developed theoretical model, which takes into proper account on a statistical basis the contributions to energy dissipation deriving from microscopic magnetization processes, a general loss expression is obtained, which permits one to compute total power losses, just knowing two parameters. These c…
The population dynamics of dominant planktonic diatoms during the eutrophication of Mondsee, Austria, are described by analysis of a 36 cm in situ frozen sediment core from the profundal region using tape peel preparation techniques; the results are compared with data from plankton investigations. The development of M…
Temperature dependence of magnetization and anisotropy field of Nd2(Fe1-xMx)14B, where M = Al(0 \leq x \leq 0.10), Cr(x=0.05), Mn(x=0.05) and Co(0 \leq x \leq 1), have been measured on single crystal samples grown by the floating zone melting technique. Substitution with M for Fe in Nd2Fe14B has been found to shift th…
The self-consistent-field multiple-scattering X\ensuremath{\alpha} method has been used to calculate the electronic structures of substitutional chromium and manganese ions (valence states investigated: from +2 to +6) in cubic ${\mathrm{BaTiO}}_{3}$. The energy levels of the 3d states are provided, compared to the val…
Abstract An aromatic, diether‐linked phthalonitrile resin, prepared from 4,4′‐bis(3,4‐dicyanophenoxy)biphenyl, can be converted into an environmentally stable, highly conductive material by thermal means. The conductivity of the pyrolyzed polymer can be varied and controlled as a function of both the pyrolytic tempera…
The following sixteen reference patterns of boride, silicide, nitride and oxide ceramics represent the second group of reference patterns measured at the National Bureau of Standards under the project “High Quality Reference Patterns and Total Digital Powder Patterns of Technologically Important Ceramic Phases”. Inclu…
Maghemite in Darling Range lateritic duricrust ranges from 2 to 10% in abundance, contains less than 5 mole % Al and occurs as aggregates of very small ~ 150 A subrounded platy crystals. Corundum is also present, ranging from 1 to 3.5% in abundance, and it contains less than 3 mole % Fe and occurs as rounded (~250 A)…
A model of hydrogen trapping and retrapping in hydrogen-charged iron is suggested and support for it provided by the thermal analysis technique. The theory, which can pre-estimate and describe the behaviour of supersaturated hydrogen in interstitial sites of a normal lattice, considers the variation of the equilibrium…
Two new glass systems based on a range of lead‐indium phosphate and lead‐scandium phosphate compositions have been developed and characterized. These glasses have a relatively high index of refraction ( n = 1.75 to 1.83) in the visible region and exhibit moderate dispersion (Abbe number ∼30). The ultraviolet absorptio…